This half-inch square ultra-low power energy harvesting LiPo cell charger ... battery health monitoring and undervoltage protection. [Kris] has been using the board along with a small 2.2 Volt ...

A few years ago, [Lukas Fässler] needed a solar ... the power generated from things like solar panels varies under different conditions and loads. An MPPT (Maximum Point Power Tracking) charger ...